French President Emmanuel Macron has rejected Boris Johnson's demands to renegotiate the United Kingdom's Brexit deal, insisting that the terms of the current agreement are "indispensable."

The UK Prime Minister told Macron that the Westminster parliament would never sign up to a deal which contains the controversial Northern Ireland backstop, which is designed to prevent a hard border with Ireland after Brexit.

However, Macron insisted that any renegotiated deal would have to retain the backstop.

"We will not find a new withdrawal agreement in 30 days that will be very different from the existing one," he told reporters at a press conference, alongside Johnson, in Paris, on Thursday.

"She said if we can do this in two years then we can do this in 30 days and I admire that 'can-do' spirit that she seemed to have and I think she is right," the prime minister said.

"I think that the technical solutions are readily available and they have been discussed at great length."

He cited a report by Conservative MP Greg Hands, which lists a number of potential "alternative arrangements" to replace the backstop, including a "trusted trader scheme" and checks on goods taking place away from the border.

The Irish government and other EU leaders have previously insisted that such measures would be insufficient.

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